When Tweens created by TweenService are added to Cleaner via Cleaner:Add(Tween), they're not cancelled.
This happens because Cleaner checks the typeof of the object being cleaned up, and Tween reports itself as Instance, but Tween:Destroy() doesn't work, we have to call Tween:Cancel() instead.
A simple fix would be to check whether Object:IsA("Tween") then Object:Cancel() else Object:Destroy(), but that's not very elegant.

As a workaround, we can always add a function that calls Cancel instead of passing the Tween directly, but the expected behavior is that Cleaner will just take care of it.
Tested in Cleaner v0.3.0
When Tweens created by TweenService are added to Cleaner via
Cleaner:Add(Tween), they're not cancelled.This happens because Cleaner checks the
typeofof the object being cleaned up, and Tween reports itself asInstance, butTween:Destroy()doesn't work, we have to callTween:Cancel()instead.A simple fix would be to check whether

Object:IsA("Tween") then Object:Cancel() else Object:Destroy(), but that's not very elegant.As a workaround, we can always add a function that calls Cancel instead of passing the Tween directly, but the expected behavior is that Cleaner will just take care of it.
Tested in Cleaner v0.3.0